Sound amplifier



`. 1, 1931. -A. l1 ABRAHAMS SOUND AMPLIFIER Filed Nov.

I'NVENTOR.

ATTORNEYS.

A. I. ABRAHAMS SOUND AMPLIFIER Fi-led Nov.

17, 1930 2 Sheets-Sheet 2 lnllllllllllllll .Illllllllllllf, 1 1

INVENToR.

BY 7% m L/W1 A TTORNEYS.

Patented Dec. l,v 1931` i ALEXANDERI. or. NEWv yogi, y., v Yy .AppiicatimmedNvembgr-rz;1930: Serienr-0. 496,114.1(

My invention-.relates tou aA new and im?,A

provedi Soundamplieri @neV of: the.; objectsgsof; my'invention vis to;

provide a Anew andi'improved '.fsoundxampliiyf liingihorn, .which isV especially adaptedifor; out;u

door use.A or lin other.locationsawhere the-.horn i is .affected .by moisture.

Another iobjeetxo'f my@l invention `iis to. pre1 vide asm-mobv amplifyingI horniwhich can'bep "'feasily.. and cheaply. construtediand: whichy Willi` not Ibe affected" by'. moisturem Anothercbj ectaof fmyfinvention is .to i prof lvidey wsound amplifying 'horn Whichl Shall.' have a-ilcomposite Wall, said. .Walli including.y `metal )orf otherA 'suitable :rigidi material i which is .not-l aiected byimoistureyso J thatL .theel horn Will have the same'resistance/.t0l moistureas. an

all-'metall horn,L Without1-having:uthe. Weight.I

forthin the. followingdeseription; and.draW.-' ings Whi chi illustrate preferredembodiments thereof, it being underetood'v that theeabovez generallstatementi of the objectflfofimyiinventionltisv intended merely to.generally.1 explain l the same and .notto :limititin any manner.-

Eigl `iS-an elevation.- v Eig.: 2y is .la-.central sect-ilonalwfview:

of Fig. 2. A Y Figs: 4; 5andil'shovv` modifications;

It= has: bee-n1 known for many.l Vyears that f' horns which were used;` outdoorsaor in other;` f locations Where moisture couldlattack: the.;

horns, gradually became deformed? because ofi the effectf of-:moisture Itrhasbeene at.- temptedz.. to.. protecthornsf'made ofi" paper;

wf-lacquer; However,` experience has Shown sideof; Ithe horn, `so tha-tmoisturecould` entery the material ofthe-wall offthe horn.l "In orderv hasibeen Iproposed t'o lmake thehorn ofmetal However ametal'hornhavling a thinl WallTkv produces adisagreeableresonanceelect, and

a metal 'horn having 'ar sufficiently vthick Wall- 50, istoo heavyfor practical fuse...

Ithasfbeen Suggested-ito makefau horn for` y 'renden the. samev Waterproof.' makeg the Wall ofv the. horn ofthe cloth mae,

A032, although 1L doV not ,-Wisli. to

United States,

and the' undesirablea-esonance ofranwall rmetal v toy maintain fthe horn@ in itsorigina-l shapefitr outdoor;A Vuseafrornf;V Specially: prepared..i and expensiveito manufacture. p

AccordingL tounyinventiona the horn Aisf.; made. of ailayerf. or layers of cloth,` Apaper,v on;

kmolded fibre, but such hornsrhaveebeen very-1.x

ablezlacquer orsfother, inaterialein order to Ia prefere to l terial Ashown in Abrahams, PatentaNo.1 l,5.0.l;., belimitedto this particular; material. In'. manufacturing f a hornv ofrtheslrnit material i specified:l in saida Patent No.;1,501,032;` a. mold.; is .userlwhich'may be madeof several sectionsi,l andth'e materialvis pulled'fover.thisfmolclgin.; onetoriniore.sections, and thea material.isLsuite` ablyfimpregnated andy baked. in orderitoi` *hardeniit andptoncause ittoassuments final.' 70:;

clesiredshape.- A In: the, embodiments .shown inV Figa. lef..

a horn; of. ordinarily. conventionalA Shaper is;` Vshown,v ittbeing understood". that the invern,vv tion-is not.; limited to anyf .particulars Shaper.' 75e i y of horn. This horn comprises;alcontnuousw outer.` layer; off-material; l; and. a continuous innenalayerf; of? material.; 2, the` layers..- l; and 2 -being.made. of; cloth,- paper,orrotherasuita able non-metalliefmaterial. 30ev o Inithis; emhodiment. three metal. sections 3, wandj 3b.j areutilizedsto preventthe ahorni from beingA deformedby the t. action; ofrinoise-f ture."` These metal sections 3- 3a@ and..3b:1f havethe. desirecli` shape, and theyfcan; beJap-` 35ay plied toitthe;y outsider` o the innerrla-yer of. materialafafter. said inner. flayeri 2r has.; been placed,J upon;` .the mold; Thev sections .--s 3;. 3a.;y and. 3b.- can.. beheld; in; place by. vsuitablegf ad.

hesiivei. suoli: as the iinpregnating materiahgun which 41s usedi for `coating-orI lmpregnatingg` the.' layerY of material 2..

The outer.layenofV material l is then appliethit'fbeing. under:- stoocl that;` thisA outer layer'is'.` also suitably coatedY o rz'impregnated. 95:4`

. The: useofseparatedmetalisections makes.; v

vit much 1 more :easy to finanufacture. the g horn.

and :the Weightaofl the.I horn is also, dimm-.- ished. f f l v Tfhefhorn isfprovided withthe usual metal 1001 5515] other. suitable; nomnetalllc, materlal, Whichi 1 must be impregnated or coated Withiaisuit` closed.

end or ferrule, which is jmade of any suitable metal. The layers l and 2 extend into this ferrule 4 up to the mouth la thereof. The innermost metal section 3b also extends within the ferrule et. I-Ience, when the horn is held in the position shown in Fig. 2, the

ferrule 4 acts to shed water. The space between the metal sections 3a, and 3?) is bridged by an outer metal thimble 5, and this outer thimble 5 is held in position by any suitable adhesive, such as the lacquer which is used for coating or impregnating the layers l and 2. This lacquer may be of bakelite or varnish, or it may have any suitable composition. If desired the outer thimble 5 can be connected to the inner sections by screws, rivets, etc.

The bell of the hornis also reinforced by a ring 6 which is made of any suitable metal, this ring being shaped so as to clamp the wide end of the horn, as clearly shown in Fig. 2.

If rain falls upon the horn, it cannot penetrate the outer layer l intermediate the metal sections 3a and 3b, as this is prevented by the outer member 5.

In the zone between the metal members 3 and 3a, the taper of the horn is so large as to effectively shed the water. It would not. be departing from the invention if an additional outer member were provided to bridge the gap between the members 3 and 3a, this outer member being similar to the member 5, which has been previouslydis- However, this is not necessary, and the use of a single outer member is preferred. It is standardv practice to make these horns of the exponential type, and experience has shown.that it is not necessary to use an outer member 5 at that part of the horn which has a large taper.

As shown in Fig. fl the three metal sections previously described may be replaced by two metal sections 7 and 7a, the constructions being otherwise the same.

As shown in Fig. 5 the metal sections previously described may be replaced by metal sections 8 and Sa, so that the bell end of the horn, which has a large taper, is not provided with any rigid reinforcing members. The construction is otherwise the same.

As shown in Fig. 6 the intermediate metal sections previously described may be re placed by outer metal sections 9 and 9a, which are on the outside of the layers la and 2a, said layers la and 2a being similar to the layers l and 2 which have been previously described.

A horn of this type provides the resistance to moisture of an all-metal horn, while making it possible to cheaply construct these horns and to lower their w-eight. Likewise, the undesirable resonance effect of thin metal sections is entirely eliminated.

It is not essential to protect the inner surface of the wall of the horn, because the horn is so held as to prevent rain from falling into its interior.

I prefer to make the metal sections of zinc, aluminum or steel of 20-22 gauge, although I do not wish to be limited to any particular metal. Likewise, while I prefer to use metal, I do not wish to be limited to the use of metal, as any other rigid and waterproof material could be employed in place thereof.

The metal ring 6 which is located at the mouth of the bell of the horn is an important feature ofthe invention.

If the horn is made of fabric conforming to said United States Patent No. 1,501,032, the fabric may be impregnated with a water soluble filler, and it may have a surface coating of a suitable waterproof lacquer, varnish, or the like. The metal sections are made by spinning, and the cost of spinning is much reduced by the use of separate metal sections, since the cost of spinning a metal section of the type shown herein, depends upon the length thereof.

It will be noted that the improved horn has a composite wall which is made partially of metal and partially of non-metallic material. Likewise, the metallic material is laterally spaced from the inner surface of the wall of the horn, said metallic material being between the inner and outer surfaces of the wall of the horn, in the embodiments shown in Figs. 1-5 inclusive, and being located on the outside of the wall of the horn, in the embodiment shown in Fig. 6. I do'not wish to exclude from the invention a horn which may have a vmetallicsection or sections on its inner surface, but it is preferred to have the inner surface of the wall of the horn made of nonmetallic and non-resonant material. A single metal section, of the full length of the horn, may be used. The metal sections are transversely continuous since they consist of fiared tubes, so that they protect the horn against moisture.

I have shown the preferred embodiment of my invention, but it is clear that numerous changes and omissions could be made without departing from its spirit.

I claim:

l. A loud speaker horn having a composite wall which is made of non-metallic material capable of being deformed by moisture and of a plurality of transversely.continuous metallic sections, said metallic sections being longitudin ally spaced from each other, said metal lic sections being also spaced from the inner surface of said wall, said horn also having an outer protective member around the adjacent ends of a pair of said sections.

2. A loud speaker horn having a composite wall which is made of non-metallic material capable of beng deformed by moisture and of a plurality of transversely. continuous metallic sections, said metallic sections being longitudinally spaced from each other, sai metallic sections being also spaced from' the inner surface of said Wall, the interiorrsurface of the Wall being composed wholly of non-metallic material, said horn also having an outer protective member around the adjacent ends of a pair of said sections.

3. A loud speaker horn having a composite Wall which is made of non-metallic material capable of being deformed by moisture and of a plurality of transversely continuous metallic sections, said metallic sections being longitudinally spaced from each other, said metallic sections being also spaced from the inner surface of said Wall, said metallic sections being located between the innerV and outer surfaces of said wall.

4. A loud speaker horn having a composite Wall which is made of non-metallic material capable of being deformed by moisture and of a plurality of transversely continuous` metallic sections, said metallic sections being longitudinally spaced from each other,'said metallic sections being also spaced from the inner surface of said Wall, said metallic ysections being located on the exterior surface of said Wall, said horn also having an outer protective member around the adjacent ends 0 of a pair of said sections.

In testimony whereof I aiiix my signature.

ALEXANDER I. ABRAHAMS. 

